3406B turbo upgrade

I have a 177148 on one of our trucks. I agree with @wore out on the performance of it, but for your application with a lot of stop and go and short runs it might be just what you need.

 

I 100 percent agree if stop and go is a big part of what a trucks doing it’s hard to beat that 177148

 

The wastegates function is to keep the compressor wheel from overspeeding or running on the left side of the map out of its efficiency range. I do realize that they seem better with the gate pinched but in truth they are best left working. The waste gate lets exhaust around the turbine to slow it down. Too small of an exhaust housing is why the gate is needed to begin with which creates a bottleneck for lack of a better term raising your drive pressure. Ideally drive and boost should mirror each other. That chuff or stall is from boost exceeding the drive pressure. That bottle neck also chokes them up at higher rpm. This next statement is strictly opinion with no factual evidence to back it. Yes the 177148 does spool quickly down low, which a B was never designed to do. The extra air at lower rpm can be hard on #### I e rods and one piece aluminum pistons Now that said it sounds like I’m talking out the back side of my face running compounds on mine. But I’m running a C15 crank and rods so

 

The difference in the 2 177248’s you mentioned isn’t in the Borg Warner turbo but in the CAT turbos that the 177148 is a direct replacement for. The 7923 is the later of of like a 6NZ and uses a slightly bigger exhaust wheel in a 1.42 housing. The other is earlier like a 6TS and 5EK uses a slightly smaller exhaust wheel and a 1.41 housing. Now the 177148 is a 1.32 housing so see the difference there? Even though they are advertised as direct replacement doesn’t mean they are the same. And I know loddy doddy everybody uses a 1.32 on a 14.6 and 15.2 but they are a bit small for the flow in my opinion again opinion. The 199119 is the 460 turbo. Once it’s lite is a hoss but it will be slow to lite. The 199114 is the same compressor side but smaller exhaust housing. It may work better the the 119. Course all this aside and even in sharing my opinions I will admit if I was turbo in a dump truck…. I’d most likely go with the 177148 or a CAT version of it. Even if I bought the CAT version used at a salvage yard to save the core cause that’s where they really hammer you. Course I understand it ended up hooked to a truck they scrapped and may need to stay there.